SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c79ae9f03caf7590392c350d7222426cb8b086bae9eb17355e8b2a0c1d86524e' 
  AND token = 'aYufQL+qcgdOjh/kNzfw5jY4BYB3GxhUrhCVx6try58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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