SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7371cc7f3cc89220b7933e5a947f30796315cd4f919777b376555ffb486a4b6' 
  AND token = 'aPwERMsUjeO7O9uSkDKLYQEJ+ev/svRyhSQm8CyhqDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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