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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08c601fc9f808949d4f733dd0788aab64bf60dc50916e9153f9b5ecbe88b08b6' 
  AND token = 'Y35O0iGArnNzbCBNYkSv3xmWHqdiBti/gWeKnxGENiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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