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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95a0f3a643dc59e66b5026caffda90ba5978943db26bb67334cc6aaafb9362ad' 
  AND token = '/t1sL0aC5AQFkHQL0awxik13jErrah2VVsTxKl5mWHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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