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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae69a36de98d607ceb9873dfb105a911ee4a35687d234fdbda174f9846bd18e1' 
  AND token = 'CgPh+V0F7h1izD5xBurPgxZg00em81ZXaou6TeUlBN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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