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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c93eaf6bf877a9d41a48afe6badedb48532c60dbe4a7cc881149aad604bbfc7' 
  AND token = 'iWrS43iy9XWOTzyl6+BwSgqpgObxFqpIyY1pgtB+JR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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