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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d8ddaad9f1a9cb7ec0c8bf0e9ebccc4080076f6978f0d5e8bc791b45eb6c669' 
  AND token = 'ZceYujAjFtXTwGlVG38wd8G00IzmoFSxX6UiFKNsmfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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