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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae5ea3a732b8fea9bc7b71addc137cda055744d775af87a7c964798916d895d7' 
  AND token = 'Atga+EKZLbULMwqpIpvjllNW0imZFFi465qKAkZN5qI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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