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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2f5674a11faa2855660fc1975ba152639d5ad8d86022c2a3b6b9bcba290d5af' 
  AND token = 'qXObbFF+01MofO/OkDkU/B4GTkVnsSfu+NtWQfIOs3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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