Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93e532eed0bbe9716d38e746943e35ca6421b95eb578f87d550f68381e8daefb' 
  AND token = 'VryfPsnY5W5fDOjDJGQM4liF948RZckPGoPMd8LyFBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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