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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ded38418936f070b2c990dd42b2758b1ceb37392e9b21d7a30c6bc7284af5ad' 
  AND token = 'lV6818eEemP17O9vRMnyQI9USpKUUQQIEVrRIunff3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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