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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd71dfbcf564d5170910c53236d0c55e3fa79a7667edac82b5971c509d6d8de70' 
  AND token = 'sszaqN397w1GWIoWX87bQx8DdAAujvG8MjPkDprCP58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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