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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8736b6920d0086fbfc773df8ccc633f76caee7c946a55e121cbe7ac1c676b4f' 
  AND token = 'dcNXpMQrUbPeNJpm67Ag6xXakD0cyWdCmk7NvR+/YzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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