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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9471df4e5c0660c4b22350f915057ea645b478d050c4c50a37832871850ba1f' 
  AND token = 'XGdgnz8rZawFQ32muNB1ARmFLElNklvj35H6NmdjQ4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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