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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bee41ae22f87125a6dcbb3755764038f3e2d78052dadb8d4551039ebc7e137b' 
  AND token = 't4kIknf1bV5jrP5Vqr5sn6HxOdgMWH1DeQjuxoHGr/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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