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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '411eef5984cc5985e97a56946a7619049f7021ebe19040a7403f3abf9b66ef79' 
  AND token = 'mg6T6hLa/n9OfHgwCPYnzkqT4HSmlnfkyeb3e/qchIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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