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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83e08565b8fb6f387fc21f3446295a8eaeeae36d1233e8462fdbf210398244f1' 
  AND token = 'UjNgT1z6tjyT2KZIFbz426c8CRGvkpwxL4Z1LskjokU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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