SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '932e1b6f55748eb36059243bfdaed379d27157f989b25874d67111c61333747e' 
  AND token = 'NLOgLGmoqFMszp7n3HBVWnq7f/U/i7FzG6+98Thlo6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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