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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e27ba84970e59b2a49cee4349cc873d5b54f1212b3b2b6926fa20f60a1dc81e9' 
  AND token = '0Lavtl4z+PqQIeOSmLkX9zznyZzLq04on1xTyWO8yJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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