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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83f96da78a25c23bf9bccd9406e324bd4fa843f2ea6f2aadde04edebcdb0590d' 
  AND token = 'CC+tH8TVoIs6VBCVbi4HRRr192ZPeMPM3gRtmZ2UK9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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