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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e47bb3a7ce5b282d4ac097af7b0c15198d507267b660aed7610c84f815fc8c41' 
  AND token = 'TFs8IzOiV9pfo6gszHIh8btZRjb9kxIJMF96fFk1Gtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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