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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf9e4f69e6866f605c0fce719b21876d02f175c14e932431576d6ad4c07f5735' 
  AND token = '3FQ0bqwHU4dXdNgHvOS5tyRLcxnrhR94378bgbYKteM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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