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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bdee48a4a9d241af5eca4c9b3ec65d1e5c801a5b211d9db4358fa8f684892de' 
  AND token = 'b2ozyivcaS///sYjhpqC4hwEZzfJcFgyRCPepgh/aS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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