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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b6935c81bd5d044e1e94e62573c8c154328ad7a4d03c973ae379fc1c1cf558f' 
  AND token = 'ptA1ohC9SyvVv+/NyMK1KUYJ0W6bx7FYamTKJ4NNc/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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