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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f68ae11e96da672ddc332893e37b956dffb69e1ce58a30ec10aa239a0405d92e' 
  AND token = 'QZf0RyFQ02qK2gYzuuRuBxOSSDD/J1W/IWfs6U4w69o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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