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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a1b73b431c9364b9cf80fc1b779657e6c69e03855928876787291261143d36b' 
  AND token = 'SZ3AwThdU/z9vI8qOqs3PpPOwy0yshoLA4HoIWqdnCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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