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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc5abab9189d207abef1af2b2ad38f1ccc5492a8cf27ce7200a23d518c0745f9' 
  AND token = '8Mb11bm3UujvBDha3jISZG4Wqr3aK0GSkJheHLpPJCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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