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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd125c922b7982038bfe947b70ae76b84fe84e95caeaf46d11afd93887fab8a6c' 
  AND token = '9upPWwJlnshs4kK6dsnUoS6z0wDA9P7TVor5REVyRWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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