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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbaf7b21d7d490af15951dfbf08e60118d532467a4843756a3f987c400bfb0c0' 
  AND token = '+5KF+OOSdz000YluZcPikc65Vgx7KdMDl7zMvZHnnlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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