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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cccde86c4ff18a78e2fb96219fc0a44e1862716e9ba08d6794cb61c4bb18f245' 
  AND token = 'cOzlmyVJEk1mVklDScfWvyLwYi1u63qj6smsi5/4di4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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