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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9166d0789139b7b1d37c13e6733e179d8ed1cfb9dfdd4308c29603ad4fe799e' 
  AND token = '/EXrXvxpw3vsYGJvLXy8efkST70QyWnn9JmJyL9VKXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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