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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b23546e1e4abb401b72b293d5cc6d8242fb293bea3a112bf7b5c34cb4df66876' 
  AND token = 'jT4N0yrPZcVQN51EvF3w5L7RHFkrZuZVQlJt/D/Bkog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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