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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe9c13f802613943f9f5d175951a6cbb13dbc37d9e92dd60bfc7c03b44640743' 
  AND token = 'lT4iTAJ2E3s92YFQG3JJ8zAwW+0bNoY74dpqoSW8BII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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