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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '821731052ad269893d22744f42532d28136ae7812791188c48ae828d735bc15d' 
  AND token = 'XJQU1eQYNYJjP3STn0dzywiAnJ6cABbh3WKSLIJ4ymA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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