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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2920ec86c6c1f289bef0fb47d293584b41bd0214f50393a56e6e03ae4930ac5' 
  AND token = 'ayCDvBiy4kRr4pDaepS+J300+VfKJWRUPdrftvsXWrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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