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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '760d1e2b769ddb07481ac2489c911f3e468129ae7fe617339e55044e1ec60049' 
  AND token = '2yBZob2kSF6fXlGZelomwVUTVrZ0gjUqZMqK/a60iMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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