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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6281bcf11e462ad863bcc512d1e3fbd8cdafba0041f70579bdb5398db9d829a0' 
  AND token = '+8WtJPcYlNHHYte+3W+uHhEuD55bYnYrY6omy4tYAjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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