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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '405f789461a5c1606ffd2ed5857fb3e21287de47d0e470c2f358def0fd5b23d1' 
  AND token = '1l457xJH1Sjpl7DV2hmQ7JrPXlchzjeGeSAKGGAAOIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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