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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfc8dfde2aee34e94d58e99d48ff9a1ce8a8098a98623fb8c22f5a0d734f2494' 
  AND token = 'IysnM18WsIx5DyadSYnjV28SbrYl9kLsBbBhJ0aK/Bk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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