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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf3c5eebcae6d10780fa2659619c2dff44ca832c58f53a819324654d00ba49b9' 
  AND token = 'D4odBB/X8maFuj9LM/hGCp3fkWPcao6WnFDjgiq6DxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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