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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87963ddfbe54dc2d6d2bb11ba97ce2d8dfebf9ce9f207e7a3dba1896746fb7f3' 
  AND token = 'TQg94oSzCBo+g87gQuvBd1XbcG4kYQmJpjJ+YeGgwfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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