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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8821ac899d5ec07afa91368eef5ad66d90ee7f4966e4fb868583b40e561f528c' 
  AND token = '6Eeh3GcdjHAuLmchxxjfbnEg/bQFeoO9Q/PqzEeoQGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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