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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '226731c4263f72f602053497c534af63a3ea9c033252d879b7a9ec27166629f6' 
  AND token = 'rzVRlG9WYQ7Q3OQuyrXaYWY51et6GOON9nvtYrBO7ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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