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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b412fbc2b89741b4422257af42edb0232db196bc37a676c583c8f258beac760' 
  AND token = '7aLdxVc1W3SNbQQ2NbuREGXOOqwZ9i45fE5q2cK4ZAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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