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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '843226832ff34a0312dc6ba7bb4cde0a3cf0d6bf766bcbb8be2b49a10a85c33a' 
  AND token = '/LTIXlth19z81trwhT6TZ+W3k+FnT8s9U0nZXQ6uVfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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