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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99c79de96bf3a2da2d64cccbb3c2e32ef23675911ee7fd4bb2dc5a94c20ca2ee' 
  AND token = 'jQDanOTtNJ1W/zpnEX4kMRlww2ZPuN9VOSvF5CveTcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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