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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c6de570339720722ccf46ff8558f2102167b9ba17811ca3bb76b4ee4bac27fb' 
  AND token = 'sDQPKKN8ux2wZq0o95rJW7YOONkWYPSWEkWbapv79XQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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