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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db11fbd86416625695e562634a84fcfbeb71a1384c1df2fd6f09375c0d80941d' 
  AND token = '4BpCaKa1+J3+5YdiliML1sOwp4S9VIbK3hGw6pGnKfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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