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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91d78eee41a778a5ef396f0a4b88180056ec283909d9bfcbb3753da285fb77ce' 
  AND token = 'bHYKQ5XGpXzgZIAQXCyXuKz9btEU+HTNxnO/1VS8uaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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