SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a45df4c15004f52b96a1fe71358b95638f9891347a551500c8a0546adeef1c2' 
  AND token = 'Ti9QC5MZNnFW1wxUkvO8jmq/WZP0hlAPEKpGvdvJ2U8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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