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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ca5cd90ec81bfaefeadeda8d80fadc996a8be28f6b032fffc8a542935d57718' 
  AND token = 'oSrCFfL2xb5zbCR1xY4UrPXnaX0fAoIpUSf4D/n3RWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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