SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '535203d0d4449fbbb687a28e18f065890c5fc2897167ff0a4bc124c847d5182f' 
  AND token = 'EVOO4LjLpWvvhg68xiq2q1zDcKyJycAzDHxBm2jI7BA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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