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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c600263ddad0f6d16b39fd69ed0788589722588a930de8a4b8a3141361739a5' 
  AND token = '0KNGRU64V7oxlDbvpDwLDncUmURllFeHmprL2b5ou/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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