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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3b79df05faabd6a1af88995552d4d30ff2681f7b9cef763bff772a57f8c8c91' 
  AND token = 'cysab8ACSvT4AfLCS+YyOiYRrLt9Q9dg6qVpUi7E1/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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