SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '183128365c103fa70706a1b9722d46d8697e484f99e1ef93509b2604d1174b45' 
  AND token = 'LH41ynjwCOU4KkvJT/kI0Bcv4xYJDuWum9GE3OgdK6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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