SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff4bff19ce4abdc9ec77d3fb704cb3ea59c05076cca9c6e1246525a85a2c9167' 
  AND token = 'hSPXvYz/AwZF1gy52qwWWMOe+UK+mx8PuUOS/ukodVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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