SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22beb1129fe676b895711274544b63bd2b84f7ee5bb9a8ec2cb51584d839cdf5' 
  AND token = 'x2B1l9HKwdTqhSbhBs+KlF3/4HU1tLK9VvLoOrFfs8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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