SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '377c19c8902a93de2fd942ad2a74e7d66ae3f19bb6b5f21d885c57c206fd9160' 
  AND token = '9yS5q4MbUOzJJKopKCltzfH624mINwlV5avNg824/FY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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