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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05713944541347670100dcf5ed79f45ebc0e8aa9a6561831edfbadb471cf3dd0' 
  AND token = 'VYujd3RAo0eMDzHz64W5KnNplRT/hNClrGcvtW/1TrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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