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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74856f8abe35c5a7040f7a40f067a2b626a3f7261bbec723e5e80be3a8d299ba' 
  AND token = '9ApKusi9kzGI3qJSHk5eFb4wSli1W2iZnILeSuzCTs0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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