SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe2faf56ae31c5297b9cec64062df242ea9633f8b7a8c355660b07927d4b0f17' 
  AND token = 'jxJFYnCliLSX0nHkZLgMLuztVM6N7jQHT/wvjwejrOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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