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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66809e0df40694863a0caaf3f50359563d9b569585e49827500cc301cb609de8' 
  AND token = 'rDJfK2xn2Bp5l4Cuaj883Xu6aPLL6jlnVzhJmP5A3iE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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