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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9e8e70803062f87e15d1bc78e472c7f4e6e60d49abc1f7fa709ca87b45203b5' 
  AND token = 'i3W9YzjHWxeJfQ9Ycq8xF/N9KmgUzp2cJr7g8vJGKkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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