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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caeabe47c80ec592a0913da0ca4fb1f2c686c16a18786f38e870a967577d733b' 
  AND token = '5xXHrztFHG+Y98iPXTU7bplSpTOHOAJq2PSsZzVUk8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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