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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2423dafe239afa440794d5e55e63bc3b1450deb0cbcd38402b942591914044ab' 
  AND token = 'ATCsKwylpIIC7V9SzWVi/uIslWbdZWx51KDW4xFsIUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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