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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7514fd15124dffe53e95fadb04a9e1032190110cebffd1c5422f343f641a28c6' 
  AND token = 'gx1Qz9s1IklHrjsg/nLuPzp7MT4aqQFa32ALzRMI2Zk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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