SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '172edbfceb40a9f87fa28f325264bca3891185909461fdb1d0096fcbf2a992d9' 
  AND token = 'PH/FTEfYfwyBCsKg6u+kPBluIKQCSjZK8CURF6mi/ko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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