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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '308e16ef46503248e2b268d70920dc940c65666014cfa70f9c99f4981654b17d' 
  AND token = '9b+uEfHeq/xPL2buu9B+thA91UCfGGrboASUKKC+Bi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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