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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fa40809fc0916eedc40ff5862c1fa6e4364feb5258a724738422633b8084d12' 
  AND token = 'xeiYhTk/PrRrZ4+N3lIR6kyhhBJFNGb13Ts/6/9ADYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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