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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd284e1f841fa7fdb91521e62dcb9c1b4f2ec1ef8e84b060b9798a19471288f4d' 
  AND token = 'Yu53Imvyjt+o0w6SyGwd8nGP/dnAJXD7DICst6mbd7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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