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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd16ab6ddbab223ccdd5cf4a6d1dbbeb71476c8cedabaa6695560f5478a9187a8' 
  AND token = '64DpZ61B/tpS5SjVo3ZNqWa+mZpaaOXa+s8srJNpCa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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