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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61fce1ce39c9bd1ec333bb84ea8136b07e00f797e3d929bc6db52a958a9c2971' 
  AND token = 'oJSlli0OiI1QIWrAbO7InGkXzt560w13JVM6YT+zc3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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