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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '462739d79df21487e5c07e9bf1af4a9779edab8cc1fb4d00f58289a5678bd569' 
  AND token = '2dCB7NdZt9oZV6F9ZP5P8UfynwTeEn8jlT3JxCTqR8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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