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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c13f53e6111154ef871d044870cfd9f1470081a88a93bc0c1e1b10f6d9a7a453' 
  AND token = 'C9UEyh63CEuIhiUv/AeW88QWAriKS470MNwyYxBg8UU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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