SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ffc92a468a21f2f3bc964dc6d7fe41c7ba03864d42852f3b3470c3e6b1713b8' 
  AND token = 'upbBjsjZir4Dx+RYp+difrzgvVNB1szPRkBsJ5JFPLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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