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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a3d2b649a4e1bfd46fb5ef19e6cb82a2d4bfae6a3c6206b25d039cc488cdc1f' 
  AND token = 'bbXMhpNDDZhZ82HXcVqRcur39299MxGuv2u+T6pNfS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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