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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab00a7d4382ed7bb89c4b26579960c637ac705dc19a67334d3fdf0ed55d5de5a' 
  AND token = '7YgDVtRDQWb/fGG0CFcH7KvZSWiTS3O27HcXShdTgnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}