SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04c2ac78980f8bbf19394a2ab942c486b33484dbd4d42811871aa526fdacff75' 
  AND token = 'Atv9qRqX26c+YiZb4w5/WBCmOZSN1XJ/PvPCeX+fJoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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