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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41ee280d9681367c8bd357bedc2e9aea2691c68b931d64b1d4e413dd70db86ba' 
  AND token = 'XgGUgVFsZX9fkQYdqcCD+L4GewfwgAAX3KAFW+TPSCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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