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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1064fdf24b91923b9639a4873e4302ccc630e0ae0998de4ce73d7ddc4117a212' 
  AND token = '5T9dQSkX9RC2nMWCqygfI4zEKAlP0ScQo0UGNHOu0SU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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