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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '028fb4536c0e86c6b638f1f1796fac8eab07451cae6bee471c48c81fae0502f4' 
  AND token = '5GQUYuMy6yJnVPBU0nG+ZhXG7J4zR+f2YRzDjlOG9ME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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