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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '481a28afe197d9fc88a2c1a19c588a9a6f0eb0a5ab670cb20e4b092b6aa33320' 
  AND token = '02651gPAX3wjHDAgcE/0yvFCEeiqmMoV4PYBc2BeZzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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