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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c31aafb19fe0fe1fbd314e1cbcb4cd98ce79e8ab1a9d4f234cbcf3cabc6d2ec4' 
  AND token = 'Eha8trz3qBu9Am+qZo0BvuRo1pRXj4olg2EOCP8kJs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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