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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d3f8c8d661b49dd411232d92a3755a5cc4d986e74af8b5267f8efd04ba83f3a' 
  AND token = 'tD575fmvdM1at06jsehnVxm9k+vKRmgUE7OovSoBj8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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