Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efd8f0310bf02b5cf4967095f71d9ef7baf5bd74c5d680f11844030907c8aa76' 
  AND token = 'akC+wYYFj5JR2NR5DuLwfT/wA2uCVJsvHHbX0rCart8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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