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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ed91e662de5f2f95a16b388f4e2e5a12d0c7d2af51f3dd2b6665f7ceba86d6e' 
  AND token = 'r+B5oZfwWOUNNl9wI8xqkrwIUQSE+e7/rlKALGW7nME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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