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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce0d7d5a6e26f8c841e6659a249e302358696becfbfcb923d61cce58f1a3e894' 
  AND token = 'jYgHp58S8lq+OYNyFF5yqj7oPBOXzKebnJ63x48Xyuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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