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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e331f3e4b734f0821ecb1a5c1c3f63e0d1364eba7fc7ecd6ba9b38b30abb3d3' 
  AND token = '+r+CpUJ2Gmh4MapKJm810GPJXJx6WbyfmOQIbER2MwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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