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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeb4240e6a8549642783b7e06438675a2be6cdb9953f66e60af9bab404fae9ee' 
  AND token = 'Bo236xkWSs864XgXFTrYGs8SbyJYuM9UQZ61Q9enezQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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