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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3382f3ebeecce8ef0dfa37a25d6058442fe6401673246681c038aaae87759bc0' 
  AND token = 'qlqvO5f9Nh2u/Wi2j1Zin+d6KuYxSLW+59L6lUC4HNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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