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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '919e671a537a5b23275e8695ab71bb0c0a6fb1f3678b96d2898bd03935214edf' 
  AND token = 'tK7J/wbgQcwFol5KEocSuK5YxQMPcTXkT3hF4HrBueQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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