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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccffca34206c30269f2ddbcc32e42efd4a4076f966d3ead9d2af95fe2977678b' 
  AND token = 'u6puVMja9p0pwLxVDW5qTxWU5uIQeWkrKvbMP4ZAIME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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