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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '032942d6b2e8cf7c4265d79b0fbae23479f7ba08d8cfd97f731cdc538818f269' 
  AND token = 'rjryF1PPg301cNq6VtIY13XUTcLuCmSvp4/cfm2e8hU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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