Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f566ae8e54879220130665f73c746b2cb93e337e8bf79c8b3f21bd190b1387ef' 
  AND token = 'It5nBtc3oltMfaeztJQAB3jg9uddD/tt7yszMBglzhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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