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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0a71497f57428eac27196e5c3e2ad32867608f1ea34c157f33afd876c59f613' 
  AND token = 'CHaLoz+WQ12Nk258+FasOGWL2TU7mO/mU+P9QY5srHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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