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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5720b0f7a211bbad103a6c0183b3d4d786241d1adb10a447f3b8991fb0e9ce9f' 
  AND token = 'YS0tB+PXJr5Xmwa184UUfhjCYXhjtoXdqR3hCV/LJmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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