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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '899af00d914ae7e3dd7b209b2365d9579c58583a5beb034cfa37d20c510f3617' 
  AND token = '6w9s9qN+YWXElGq6QCKP/TwwlANc4eKMh/O46lkwqoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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