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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9279a525f4900f5cefed0dae16e5badc3f318d63ff540feb4171b3da4e7fe19d' 
  AND token = '7hK0EzeSgGtGt3b7YmHFQr4SsTnbtK924e/vvy9vdiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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