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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98febb6e8ef8f248731f9637fe2770da1c9be974ed0e836e269291b9967b11f3' 
  AND token = 'ViT9lN9qEfqKi8dGD8LqQiUelgUjowtyFUQiYbzz/eQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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