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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '972ce03311175fede41e8ed8fec966097c7fdda51d6ffa08923feb2c77348cc2' 
  AND token = 'p3Ija+xNLQ7JxrZ6R0UCBIQg0Ut+PVPERV9UDJy1IGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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