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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76308c66f8d7fe43181c442370967f7042a781d7529e8a4146bfade7b6f1e57a' 
  AND token = 'PxkwbEG4X7jJAazoVrzHlkbsNsAXSgcw/o3JFE6K44Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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